我用file_put_contents上传图片，但是只能保存在当前目录，怎么把该图片移动到想要的目录呢？

<code>$id = $_POST['id'];
$name = $_POST['name'];
$address = $_POST['address'];
$phonenumber = $_POST['phonenumber'];
$image = $_POST['image'];//得到图片
$imageBase64 = base64_decode($image);

$host = $_SERVER['HTTP_HOST'];//获取主机IP
$post = $_SERVER['HTTP_PORT'];//获取主机端口


$imageName = $id.".png";//生成的图片名称和用户ID一样
$file_put = file_put_contents($imageName, $imageBase64);

</code>

<code>$id = $_POST['id'];
$name = $_POST['name'];
$address = $_POST['address'];
$phonenumber = $_POST['phonenumber'];
$image = $_POST['image'];//得到图片
$imageBase64 = base64_decode($image);

$host = $_SERVER['HTTP_HOST'];//获取主机IP
$post = $_SERVER['HTTP_PORT'];//获取主机端口


$imageName = $id.".png";//生成的图片名称和用户ID一样
$file_put = file_put_contents($imageName, $imageBase64);

</code>